spinlock.h revision 270710 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29#ifndef	_LINUX_SPINLOCK_H_
30#define	_LINUX_SPINLOCK_H_
31
32#include <sys/param.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36
37#include <linux/compiler.h>
38#include <linux/kernel.h>
39#include <linux/rwlock.h>
40
41typedef struct {
42	struct mtx m;
43} spinlock_t;
44
45#define	spin_lock(_l)		mtx_lock(&(_l)->m)
46#define	spin_unlock(_l)		mtx_unlock(&(_l)->m)
47#define	spin_trylock(_l)	mtx_trylock(&(_l)->m)
48#define	spin_lock_nested(_l, _n) mtx_lock_flags(&(_l)->m, MTX_DUPOK)
49#define	spin_lock_irq(lock)	spin_lock(lock)
50#define	spin_unlock_irq(lock)	spin_unlock(lock)
51#define	spin_lock_irqsave(lock, flags)   				\
52    do {(flags) = 0; spin_lock(lock); } while (0)
53#define	spin_unlock_irqrestore(lock, flags)				\
54    do { spin_unlock(lock); } while (0)
55
56static inline void
57spin_lock_init(spinlock_t *lock)
58{
59
60	memset(&lock->m, 0, sizeof(lock->m));
61	mtx_init(&lock->m, "lnxspin", NULL, MTX_DEF | MTX_NOWITNESS);
62}
63
64#define	DEFINE_SPINLOCK(lock)						\
65	spinlock_t lock;						\
66	MTX_SYSINIT(lock, &(lock).m, "lnxspin", MTX_DEF)
67
68#endif	/* _LINUX_SPINLOCK_H_ */
69